GPU memory sharing

Hi,
can someone explain me how hybrid rendering works in SketchUp. If I have 3 GTX 1080, does the GPU memory is used as a sum?

There is a lot of misleading information on this subject.

Hello,
The GPU memory usage is limited to the device with least memory, e.g. if the setup consists of three GPUs with 4, 8, and 12GB memory only up to 4GB will be used.
I’ve passed along a request to my colleagues to provide more info in the relevant documentation pages.

Kind regards,
Peter